How to do with the Fed/state tax calculation with the middle of year new implementation

Greetings!

We are working on the new implementation of NA Payroll, with 10/01 as go live plan. We calculated the payroll successfully , we are ok with FICA/MED, but State/FED taxes are calculated at very lower bracket from the tax tables.

To avoid employees under taxed, we would want to see possibility if we can calculate using actual brackets, if there is any way to consider the accumulated earnings. At this time we do not have 2022 check history OR Balance history loaded into the balance tables. What makes PAYCALC to use accumulated amounts for FED/State tax calculation?

Also, for W2 processing, do we need to have check history / Balance table history loaded into our system for entire 2022?